ARI fix: sprintf rule.

	* ada-exp.y (convert_char_literal): Replace sprintf by xsnprintf.
	* ada-lang.c (add_angle_brackets): Use xstrprintf.
	(ada_decode): Replace sprintf by xsnprintf.
	(find_old_style_renaming_symbol): Ditto.
	(ada_to_fixed_type_1, ada_enum_name): Ditto.